<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>


    // 定时器
        // let count = 0
        // const counter = () => {
        //     count++
        //     return count
        // }
        // setInterval(counter, 1000);
        // console.log(counter());
        // console.log(counter());
        // console.log(counter());
        // console.log(counter());


        function createCounter() {
            let count = 0
            function fn() {
                count++
                return count
            }
            return  fn
        }
        const counter = createCounter()
        console.log(counter());
        console.log(counter());
        console.log(counter());
    </script>
</body>

</html>